The present invention relates to a water tank of a gas boiler, and more particularly, to a semi-closed water tank of a gas boiler in which noise is reduced, boiling point is higher, and thermal efficiency is improved as compared with a conventional air-openable water tank.;The semi-closed type water tank of the gas boiler according to the present invention is provided with a pressure reducing side which is opened when an inlet of a water tank connected to a heating water pipe becomes a predetermined pressure or more and a Bentley pipe is formed so that water flows out from the water tank A lower end of the Bentley tube is connected to a pipe connected to the circulation pump from the luminous tube, an upper opening of the Bentley tube is opened and closed by the upper end of the Bentley tube when the decompression side is opened, Wherein a switch is provided.;Selectivity: 2nd degree
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